Sewing machine



June E, i948. l D. FlsHBElN 2,442,647

SEWING MACHINE Filed Jan. 14, 1946 ffm/7 ATTORNEY atented June l, 1948 UNITED ATENT ortica 3 Claims.

My present invention relates to improvements in sewing machines and, more particularly, to the work feed dog thereof.

The object of this invention is to provide simple and highly efficient means for operating the v`5 work feed dog.

To the above end, the invention consists of the novel devices and combination of devices hereinafter described and dened in the claims.

In the accompanying drawing, which illustrates the invention, like characters indicate like parts throughout the several views.

Referring to the drawing:

Figs. 1 to 4, inclusive, are fragmentary views of a sewing machine in front elevation, with the front cover plate removed and showing different steps in the cycle of operation;

Fig. 5 is a fragmentary plan view of thesewing machine, with the top cover plate removed and showing the work feed ydog mechanism positioned as shown in Fig. 1; and

Fig. 6 is a view partly in plan and partly in section taken, substantially, onY the line 6 6 of Fig.3.

The numeral indicates a sewing machine cast- 25 ing having therein a compartment 8 provided with a top cover plate 9 and a front cover plate I0, both of which are displaceable.

Of the movable parts of the sewing machine shown, it is important to note the needle bar II having a needle I2, the presser foot I3, having a forwardly and upwardly inclined guide linger I4, and pivoted at I5 to a spring held bar I6, the feed dog that works in and through slots I8 in the cover plate 9, only one of which is 35 A carrier 24, in the form of a block,` is mounted on the dowel pins 23 that extend through bores therein and support said carrier for vertical sliding Y, movement thereon. Extending transversely through the carrier 24, between the dowel pins 23, is a cam aperture 25'in which is mounted a cam 26 on the driven shaft I9 for operating the carrier 24. As shown, the hook 26 is integral with the face of the cam 25.

A bracket 21 is rigidly connected to the feed dog I'I at its rear end portion, depends therei from and is secured to the carrier 24 by a screw 28.

It may be presumed that a cycle of operation starts, as shown in Fig. 1, in which the needle I2 is in its uppermost position and the feed dog Il is in its forward and uppermost position. The feed dog when in this position, holds the presser foot I3 raised above the cover plate 9. In this position of the presser foot I3 and the feed dog the front end portions of Said feed dog projects outwardly of the presser foot I3. When placing a piece of work, not shown, in the machine to be sewed, thesame is directed by the guide finger I4 onto the feed dog and the initial movement of said feed dog will carry the work under the presser foot I3. p

During the first step in the cycle of operation, the cam 26 moves the carrier 24 and hence the connected carriage 2| and the feed dog rearwardly, as shown in Fig. 2. The cam 26 positively holds the carrier 24 so that the feed dog Il is moved in a straight line parallel to the work held on the cover plate 9 by the presser foot I3.

La the second step in the cycle of operation, the cam 26 moves the carrier 24 downwardly on the dowel pins 23 and withdraws the feed dog Il from engagement with the work, as shown in Fig.3.

During the third step in the cycle of operation, the carrier 24 is moved forwardly by the cam 26 with the feed dog in an inoperative position in which it is moved parallel to its operative tally disposed rectangular block. This carriage 2| is mounted on a pair of laterally spaced horizontal rails 22. These rails 22 are, as shown, long nut-equipped bolts, the end portions of which are mounted in the side walls of the compartment 8. The rails 22 extend through bores 50 movement, as shown in Fig. 4. At this time, the carrier 24 moves the carriage 2| on the rails 22.

In the fourth or last step in the cycle of operation, the cam 26 raises the carrier 24 on the dowel pins 23 and positions the feed dog in its first position as shown in Fig. 1. This brings the feed dog again into conta-ct with the workfor feeding the lsame to the needle I2.

From the above description, it is evident that the feed dog is moved by a single cam in a vertical plane in an endless rectangular course. This movement of the feed dog I'| is highly important for the reason that the feed dog l1 is moved perpendicular to the work while being moved into engagement therewith or withdrawn therefrom. From the time the feed dog l1 engages the work until it is moved out of engagement therewith, it is moved in a straight line.

It will be understood that the invention described is capable of various modifications within the scope of the invention herein disclosed and claimed.

What I- claim is:

1,. In a. sewing machine, in combination, guide rails, a carriage mounted on the guide rails forhorizontal reipr'ocation; dowel pins on the carriage perpendicular to the guide rails, a' carrier mounted on the dowel pins for vertical reciproca-V tion, a feed dog on the carrier, and means for operating the carrier.

2. In a sewing machine, in combination, guid'ef rails, a carriage mounted on the guide rails for horizontal reciprocation, dowel pins o n the. carriage perpendicular to, the guide rails, a carrier mountedon thetvdowel pins for vertical-reciprocation, a feedV dog on the-carrier, said carrier having a cam aperture, and a driven cammounted in saidaperture for operating the carrier.

REFERENCE S CITED 'Ihe following references are of record in the "file ofV this patent:

STATES PATENTS NumberA Name Date 763,4925 Oakes,'Jr June 28, 1904 1,351,866 Noble Sept. 7, 1920 1,581,524 Wardwell;V Apr. 20, 1926 FOREIGN PATENTS- Number Country DateV 157,921. Great. Britain 1921 

